HEAT OF NEUTRALIZATION - Coggle Diagram
HEAT OF NEUTRALIZATION
-50 mL GRADUATED CYLINDER
-SQUARE CARDBOARD WITH HOLE IN CENTER.
-SPLIT ONE-HOLE STOPPER
-250 mL BEAKERS
This activity requires your team to construct the calorimeter, determine heat capacity of a calorimeter
and measure the heat changes accompanying neutralization for weak and strong acids with base.
are provided with a diagram of simple calorimeter (Figure 1).
Part C: Heat of Neutralization of HC2H3O2 – NaOH
- Repeat the procedure in Part B. Use 1 M HC2H3O2 (acetic acid) instead of 1 M HCl.
Part A: Heat Capacity of Calorimeter
- Construct a calorimeter similar to the one shown in Figure 1 by nesting two styrofoam
- Place a thermometer into the hole in the cardboard square and stabilize it by a split
one-hole rubber stopper.
- Place exactly 50.0 mL of tap water in the calorimeter cup. Allow the system for 10
minutes to reach thermal equilibrium. Record the temperature (to nearest 0.1°C).
- Place exactly 50.0 mL of hot tap water in a 250-mL beaker. Heat the water until the
temperature is about 15°C – 20°C above room temperature.
- Record the temperature of the hot water.
- Pour the hot water into the calorimeter.
- Replace the lid of the calorimeter and stir the water carefully with the thermometer.
- Record the temperature of the water every 5 seconds for first 3 readings and every 15
seconds for next 2 minutes.
- Construct a graph of temperature as a function of time
Part B: Heat of Neutralization of HCl – NaOH
- Dry the calorimeter and the thermometer with a towel. Measure 50.0 mL of 1.0 M
NaOH and add it to the calorimeter.
- Replace the lid of the calorimeter without the thermometer.
- Measure exactly 50.0 mL of 1.0 M HCl into a dry beaker. Allow it to stand near the
calorimeter for 4 minutes.
- Record the temperature of the acid.
- Rinse the thermometer with tap water and wipe till it dry.
- Record the temperature of the base solution.
- Add the HCl to the NaOH.
- Stir the solution carefully and the record temperature every 15 seconds.
- Construct a graph of temperature as a function of time.
Do not stir the liquid in the calorimeter vigorously because vigorous stirring does cause some increase in temperature.